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零件编号 | RE46C166 | ||
描述 | CMOS Photoelectric Smoke Detector ASIC | ||
制造商 | Microchip Technology | ||
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1 Page
RE46C165/6/7/8
CMOS Photoelectric Smoke Detector ASIC
with Interconnect, Timer Mode and Alarm Memory
Features
• Temporal Horn Pattern or Continuous Tone
• Alarm Memory
• Sensitivity Control Times:
- 9 minutes (RE46C165/6)
- 1.2 minutes (RE46C167/8)
• I/O Filter and Charge Dump
• Interconnect up to 40 Detectors
• Internal Power-on Reset (POR)
• >2000V ESD Protection (HBM) on All Pins
• Low Quiescent Current Consumption (<8 µA)
• Internal Low Battery Detection and Chamber Test
• RoHS Compliant Lead-Free Packaging
Description
The RE46C165/6/7/8 devices are low-power, CMOS
photoelectric type, smoke detector ICs. With minimal
external components, these circuits will provide all the
required features for a photoelectric type smoke
detector.
Each design incorporates a gain-selectable photo
amplifier for use with an infrared emitter/detector pair.
An internal oscillator strobes power to the smoke
detection circuitry for 100 µs, every 10 seconds, to
keep standby current to a minimum. If smoke is
sensed, the detection rate is increased to verify an
alarm condition. A High-Gain mode is available for
push button chamber testing.
A check for a low battery condition and chamber
integrity is performed every 43 seconds when in
standby. The temporal horn pattern supports the
NFPA 72 emergency evacuation signal.
An interconnect pin allows multiple detectors to be
connected so when one unit alarms, all units will sound.
A charge dump feature will quickly discharge the
interconnect line when exiting a local alarm. The
interconnect input is also digitally filtered.
An internal timer allows for single button, push-to-test
to be used for a Reduced Sensitivity mode.
An alarm memory feature allows the user to determine
if the unit has previously entered a local alarm
condition.
Utilizing low-power CMOS technology, the
RE46C165/6/7/8 was designed for use in smoke
detectors that comply with Underwriters Laboratory
Specification UL217 and UL268.
2010-2016 Microchip Technology Inc.
DS20002251B-page 1
RE46C165/6/7/8
AC ELECTRICAL CHARACTERISTICS (CONTINUED)
AC Electrical Characteristics: Unless otherwise indicated, all parameters apply at TA = -25° to +75°, VDD = 9V,
Typical Application (unless otherwise noted), VSS = 0V.
Parameter
Symbol
Test
Pin
Min.
Typ.
Max. Units Clocks
Conditions
Smoke Test Period
TPER0 4, 6 9.6 10.7 11.7
(IRED and STROBE) TPER1 4, 6 1.8 2.0 2.2
4, 6 2.4 2.7 2.9
TPER2 4, 6 0.9 1.0 1.1
s
s
s
s
4, 6 1.2 1.3 1.5
s
TPER3 4, 6 0.9 1.0 1.1
s
4, 6 1.2 1.3 1.5
s
TPER4 4, 6 300
TPER5 4, 6 7.2
4, 6 9.6
333 367
8.0 8.8
10.7 11.7
ms
s
s
TPER6 4, 6 38 43 47
s
1024
192
256
96
128
96
128
32
768
1024
4096
Standby, no alarm
RE46C165/7 only
Standby, 1 valid smoke sample
RE46C166/8 only
Standby, 1 valid smoke sample
RE46C165/7 only
Standby, after 2 consecutive
valid smoke samples
RE46C166/8 only
Standby, after 2 consecutive
valid smoke samples
RE46C165/7 only
Local alarm (3 consecutive valid
smoke samples)
RE46C166/8 only
Local alarm (3 consecutive valid
smoke samples)
Push button test
RE46C165/7 only
In remote alarm
RE46C166/8 only
In remote alarm
Chamber test or low battery test,
no alarm
Horn Operation (HORNB, HORNS, FEED)
Alarm On Time
THON1 8, 9 450 500 550 ms
48 RE46C165/7 only
Local or remote alarm (Note 2)
8, 9 225 250 275 ms
24 RE46C166/8 only
Local or remote alarm (Note 3)
Alarm Off Time
THOF1 8, 9 450 500 550 ms
48 RE46C165/7 only
Local or remote alarm (Note 2)
8, 9 75 83 92 ms
8 RE46C166/8 only
Local or remote alarm (Note 3)
THOF2 8, 9 1.35 1.50 1.65
s
144 RE46C165/7 only
Local or remote alarm (Note 2)
Alarm Period
THPER1 8, 9 3.60 4.00 4.40
s
384 RE46C165/7 only
Local or remote alarm (Note 2)
8, 9 0.30 0.33 0.37 s
32 RE46C166/8 only
Local or remote alarm (Note 3)
Note 1: TPOSC and TIRON are 100% production tested. All other timing is verified by functional testing.
2: See the timing diagram for Horn Temporal Pattern in Figure 3-2.
3: See the timing diagram for Horn Continuous Pattern in Figure 3-3.
4: During Timer mode, the LED period is 10.5 seconds. The LED period will return to 43 seconds at the
conclusion of the Timer mode.
DS20002251B-page 8
2010-2016 Microchip Technology Inc.
RE46C165/6/7/8
Local Alarm Timing
STROBE
IRED
TPER1
TPER2
TPER3
TPLED2
TPLED2
LED
Push To Test Alarm Timing
TEST
T PER4
STROBE
IRED
No Alarm
TPER4
Local Alarm
Horn Patterns
TIODLY2
T HON1
THOF1
T HOF2
Temporal Horn
Continuous Horn
Interconnect Timing
IO as output
TIOD LY2
THON1
TIODLY1
THOF1
IO as input
STROBE
TIOFILT
No Alarm
TPER5
Remote/External Alarm
Note s:
1. Smoke is not sampled when the horn is active.
2. Low battery warning chirp is suppressed in local or remote alarm
3. IO Dump active only in local alarm, inactive if external alarm
FIGURE 3-2:
RE46C165/6/7/8 Timing Diagram – Local and Remote Alarm.
No Alarm
TIODMP
No Alarm
DS20002251B-page 16
2010-2016 Microchip Technology Inc.
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页数 | 30 页 | ||
下载 | [ RE46C166.PDF 数据手册 ] |
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